제출 #896168

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
896168		I_am_Polish_Girl	어르신 집배원 (BOI14_postmen)	C++14	100 / 100	384 ms	84920 KiB

postmen

/*
* powered by ANDRIY POPYK
* in honor of  SEGMENT DECOMPOSITION and N ^ (log(N)) and hate_club_Dasha_Lobas
* I hate GeZhiyuan
* fuck you
*/

/*
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization("unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2,sse3,sse4,popcnt")
*/


#include <algorithm>
#include <cmath>
#include <cstdio>
#include <iostream>
#include <map>
#include <set>
#include <bitset>
#include <queue>
#include <string>
#include <vector>
#include <stack>
#include <random>
#include <ctime>
#include <iomanip>
#include <unordered_map>
#include <unordered_set>

using namespace std;
typedef long long ll;
int mod = 998244353;
int inf = 2000000000;

vector <vector <int>> g;

vector <pair <int, int>> edges;
vector <int> ind_ed;
vector <bool> t;
vector <int> el;


void dfs(int ind)
{
	while (ind_ed[ind] < g[ind].size())
	{
		int i = g[ind][ind_ed[ind]];
		ind_ed[ind]++;
		if (t[i] == true)
			continue;

		t[i] = true;
		t[i ^ 1] = true;
		dfs(edges[i].second);
	}


	el.push_back(ind);
}
signed main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

	int times_ = 1;

	//cin >> times_;

	while (times_--)
	{
		int n, m;
		cin >> n >> m;
		g.resize(n);
		ind_ed.resize(n, 0);

		for (int i = 0; i < m; i++)
		{
			int u, v;
			cin >> u >> v;
			u--;
			v--;
			g[u].push_back(2 * i);
			g[v].push_back(2 * i + 1);

			edges.push_back({ u , v });
			edges.push_back({ v , u });

		}

		t.resize(edges.size(), false);

		dfs(0);

		vector <int> s(n+10);

		vector <int> go_to(el.size(), inf);
		for (int i = 0; i < el.size(); i++)
		{
			if (s[el[i]] == 0)
			{
				s[el[i]]++;
			}
			else
			{
				int ind = i - 1;
				while (s[el[i]] > 0)
				{
					if (s[el[ind]] > 0)
						cout << el[ind] + 1 << " ";

					s[el[ind]]--;

					ind--;

					if (ind < 0)
						break;
					ind = min(ind, go_to[ind]);

					if (ind < 0)
						break;
				}

				go_to[i - 1] = ind;

				cout << "\n";

				s[el[i]]++;
			}
		}


	}
}
/*
axbbbbbbzbxbbabaxbbabababababababaababababababababaabababababababxbxbb
5
ababb
bbb
tr
are
aaa
*/
/*

4
12
1 1 1 2 2 3 4 4 7 7 6
11 2 1 11 12 8 5 8 8 5 11 7
13
1 1 1 2 2 2 3 3 4 5 6 6
2 2 2 1 4 9 7 2 5 2 1 11 2
7
1 1 2 2 3 3
6 5 2 3 6 5 6
*/

컴파일 시 표준 에러 (stderr) 메시지

postmen.cpp: In function 'void dfs(int)':
postmen.cpp:48:21: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |  while (ind_ed[ind] < g[ind].size())
postmen.cpp: In function 'int main()':
postmen.cpp:100:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  100 |   for (int i = 0; i < el.size(); i++)
      |                   ~~^~~~~~~~~~~

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 45 / 45